Reality is, you don't really enchant/unenchant that many things in the game if you are just playing it. So, it stands to reason that one would get more out making or unenchanting something. Especially as you can only unenchant a spell once.
Any skill you grind is going to level up fast. I have enchanted every set of armor that I have made as I leveled up Smithing, I only use Enchanted Weapons and recharge them all the time, and I have unenchanted everything I can in the game. My Enchanting on my Level 53 character is still in the 70's. So, you must be really grinding on it.